Improvement in casting tubular articles



Patnted Feb. 9,1875.

m E M L P RIDER Casting Tubular Articles.

LEMAN RIDER, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN CASTING TUBULAR ARTICLES.

Specification forming part of Letters Patent No. 159,553, dated February 9, 1875 application led July 14, 1874.

To all whom it may concern:

Be it known that I, LEMAN I. RIDER, ot' Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Casting Tubular Articles; and I do herebyr declare the follow- 4ing to be a full, clear, and eXact description thereof, reference being had to the accompanying drawing, forming part of this specification, in which- Figure l is avertical section of the mold and core when ready for casting. Fig. 2 is a view of the pattern used for forming the mold in the sand. Fig. 3 is a view of the core, and Fig. 4 is a perspective view of the flask used for forming the core.

Like letters of reference indicate like parts in each.

Myvinvention relates to the manner of forming the molds for casting tubular articles; and it consists, first, in forming the cope with its pouring-gates as a part of the core proper, so that the several parts sh all at all times hold the same relative position, thus insuring the centering of the core, and reducing the number of parts of the mold liable to displacement in pouring and, secondly, in forming the corelask with a longitudinal cut, so that it may be sprung open, by means of screws or similar devices, to free the core.

Heretofore, in casting tubular articles, the core-box has been closed and set to its place by means of dowel-pins, which, in time, become loose, and allo7 it to work out of position, causing irregularities in the core and iins thereon.

To enable others skilled in the'art to make and use my invention, I will describe it more fully.

In the drawing, D is the pattern for forming the mold, having an enlarged head or cope, d, at one end, and a core-print, e, at the other.

This pattern D, being placed in the sand in the usual way, forms a mold, B, of corresponding shape, having the print c corresponding to the print e, and the enlarged mouth d corresponding to the cope d. G is the core, provided with the cope c and core print c1. Through the cope c from above I make the gate or pouring-hole c2, for the purpose of lillng the mold with the molten metal, so as to avoid forming any imperfection on the outer surface of the casting, as I find that-by this method of pouring there is less liability ot' forming air-holes in the casting. F is the flask or core-box, in which the core G is formed. This flask or core-box is cast and then reamed out smooth, and the one side is cut or grooved longitudinally, as at n, so that the iiask may be sprung open sufficiently to remove the core C. On either side of the groove n are lugs o, through which pass the dowel pins p and screws o', having nuts c" r. After the core G is rammed in the core-box F the screws o are turned until the nuts r press against the lugs 0, and spring open the groove n sufficiently to free the core when it is removed and baked in the usual manner. By turning the screws c' back until the nuts r press against the lugs o, the groove n may be closed. Thel groove n is guided by the dowel-pins p, which prevent any vibration of the edges. By casting the core-box F, or making it of heavy metal, I am enabled to form the taper f, which gives the taper to the core-print, in one piece with the box, which could not be done if light material was used in forming the core-box. After the mold B has been formed the core O is placed in it, the core-print c1 fitting into and centering itself in the recess c', and the cope c centering itselt' in the recess d. The metal is poured through the pouring-hole c2, and forms the casting. The core-print and cope, iittin g tightly in their respective recesses, prevent any vibration in the pattern, so that it is at all times centered with mechanical accuracy.

In making axle-boxes, the flanges g are placed on the pattern D to make the feathers on the axle-box. It is evident that, by vmaking the part a of the pattern D shorter or longer, the length of the casting may be varied, the same-sized core being used in each case.

By this improved mode of casting I am enabled to cast axle-boxes and other tubular articles perfectly uniform and true, the metal being distributed equally all around the cylinder. I also avoid lins on the casting, which are formed when a two-part mold is used.

What I claim as my invention, and desire to'secure by Letters Patent, is-

l. The cope or base of the core formed in one piece with the core, to facilitate centering provided With devices for springing the box to tl1esa1ne,and having the pouring-gates formed release the core, substantially as specified. therein, so that the pouring may be done In testimony whereof I, the said LEMAN P. through the cope Without disturbing the rela- RIDER, have hereunto set my hand.

tive position of the core and mold, substan- LEMAN I. RIDER. tially as specified. Witnesses:

2. A metal core-flask or core-box tapered to T. B. KERR, form the core-prints, cut longitudinally, and JAMES I. KAY. 

